MC145173 Datasheet | Motorola Semiconductor

.. MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145173/D Advance Information Dual-Band PLL Frequency Synthesizer with ADC and Frequency Counter CMOS The MC145173 is a single- chip CMOS synthesizer with a four- wire serial interface for primary use in AM- FM broadcast receivers. The device also finds use in long- wave (LW) and short- wave (SW) receivers. Two inputs to a single high- speed N counter are provided, along with 2 phase detectors; one for a VHF loop up to 130 MHz, and another for an HF loop up to 40 MHz. The VHF phase detector has a current source/sink output and both detectors feature linear transfer functions (no dead zones). An external crystal ties across on- chip circuitry which drives a pletely- programmable reference counter. Thus, a broad range of tuning resolution is possible. The crystal oscillator is buffered and fed to an open- drain output which is active in the HF mode only. Due to the patented Bit Grabber™ registers, address or steering bits are not needed in the serial data stream for random access of the registers. The serial port is byte- oriented to facilitate control via an MCU. Tuning across a band is acplished with a two- byte transfer to the N register. The 6- bit analog- to- digital converter (ADC) has two input channels. The converter is read via a one- byte transfer which includes an end- of- conversion (EOC) bit. . A 22- stage frequency counter is provided and accepts two IF (intermediate frequency) signals. Primary use for the frequency counter is for the seek or scan function on broadcast radio receivers. A proper frequency count ensures tuning of valid stations on their center frequencies. Reading the count is acplished with a three- byte serial transfer which includes a count- plete (CC) bit. Four general purpose digital outputs are included. One of the outputs is open- drain; the others are totem- pole (push- pull). Two general purpose digital inputs are provided also. One...